"My name is Carter and my question is, which countries are involved in the International Space Station?

Carter said he saw the International Space Station pass over a few weeks ago. Did you know-- the ISS is the third brightest light in the sky? Yes, only behind the sun and the moon. We interviewed a NASA International Space Station program executive by facetime to get Carter's answer---and to give you a tour inside.

"There are 15 countries involved and they represent five space agencies, " explains Jacob Keaton. The program is lead by the US and NASA. The other countries included: Canada, Japan, Russia, Belgium, Denmark, France, Germany, Italy, Netherlands, Norway, Spain, Sweden, Switzerland, United Kingdom.

"We've been working together to build this laboratory in space for 20 years."

The ISS is very big. Jacob says, "The next time you're on a football field or you see an NFL football field, know the space station is as big as the field and the two end zones."

While Jacob was talking, we showed you NASA video inside the ISS. "It''s a big tube that kind of branches off . There are laboratories and equipment on all surfaces so you can have computers on the ceiling and a workstation on the floor and a treadmill up against a wall. It depends which way you're facing is your up and down."

Six people live there full time more than 211 people have visited from 15 different countries. "I think one of the coolest things about that is we have had all these countries working together. A lot of these countries historically don't get along and once we put those difference aside we have been able to build something for the betterment of all humanity. It's sorta like working in a group at school-- everyone brings something else to the table."